Interest and Other Income (Loss), net - Schedule Of Interest And Other Income (Loss), net (Parenthetical) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Preferred equity investment income	$ 5,716
Preferred equity ownership percentage	24.40%
PGRESS Equity Holdings L.P. [Member]
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Preferred equity investment income	$ 1,393
Preferred equity ownership percentage	24.40%